Dynamo-electric machine.



-T. HOOCK.

DYNAMO ELECTRiC- MACHINE,

APPLICATION FILED IUNE 6. i911.

1 DH H m 9H N 2 V v 4 m Mm WITNESSES ATTORNEY T. HOOCK.

DYNAMO ELECTRIC MACHINE.

APPLICATION men was 6.v 191x.

1 ,1 59,224. Patented Nov. 2, 1915.

2 SHEETS-SHET 2.

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WITNESSES:

THEQDOEE HOOGK, 0E WILKINSIBUBG, PENNSYLVANIA, ASSIGNOR T0 YVESTHIGHQUSE ELECTRIC AND MANUFACTURING CQMPANY, A CORPORATION OF EENNSYLVANIA.

DYNAMO-ELECTBIC MACHINE.

Specification of Letters Patent.

Patented Nov. a, rare.

Application filed June 6, 1911. Serial No. 631,594.

To all whom it may concern:

Be it known that I, THEODORE Hoocn, a subject of the Emperor of Germany, and a resident of Wilkinsbur g, in the county of Allegheny and State of Pennsylvania, have invented a new and useful Improvement in Dynamo-Electric Machines, of which the following is a specification.

My invention relates to dynamo-electri machines and it has special reference to such machines as are completely inclo-sed.

One object of my invention is to provide a machine, of the class above indicated,that shall embody means for cooling the windings and core members without exposing any active parts of the machine except the surfaces of the core members which are, remote from the windings.

Another object of my invention is to pro vide a simple and inexpensive stator structure for induction motors and other dy namo-electric machines.

Electric motors and other dynamo-electric machines are frequently employed where it is extremely desirable, if not imperative, that the active parts of the machine be completely inclosed. Motors of this type have usually been more expensive to construct, for a predetermined output, on account of the diiiiculty of keeping the temperature of the active parts of the machine within permissible limits. in order to overcome this difficulty and permit of the utilization of smaller and cheaper machines for substantially the same service, Whether provided with open or partially closed frames or with so-called completely-closed frames, I provide an end bell which completely covers the windings and extends from the-outer surface of the core member at one end to the shaft, mount a fan or blower on the shaft outside of the end bell andprovideother internal projectionsin order to permit a circulation of air across the outer surface of the core member. By utilizlng substantially square plates orpunchings, 1 increase Whenstator core members are built up of the magnetically active portion of the core and reduce the amount of scrap material and also make it possible to use a hollow cylindrical frame having-a smooth bore and yet expose a large proportionof the exter nal surface of the core to ventilation.

Figure l of the accompanying drawings is a sectional elevation showing a' portion of a dynamoelectric machine constructed and arranged in accordance with my inventlon. Fig. 2 is an end view of-the motor .shown in big. 1, certain of the parts being broken away to more completely illustrate the invention. Fig. 3 is a view correspond mg to Fig. 1, buton a larger scale, of a itnodified arrangement embodying my invenlon.

Referring to Figs. 1 and 2 of the drawings, the machine here shown consists of a stator 1 comprising a stationary core member 2,.a winding 3, a supporting frame 4, an end bell 5 and end frames'fi and 7, and a rotor comprising a shaft 8, a spider 9 mounted thereon, a substantially cylindrical core member 10, a winding-11 and a fan'12. The stationary supporting frame 4 is provided with a removable base structure 13 and the core member 2 is built up of a plurality ofsubstantially square punchings or laminae, the corners of which are rounded to fit into the hollow cylindrical frame 4. The laminae or punchings are disposed between plates 1e and 15, the periphery of the plate 14 being circular to fit into the frame 4. while the plate 15 corresponds in form to the laminae. The plate 14 and the end frame 6 in which no openings are provided, are

located at the same end of the frame and, consequently, this end of the machine is completely inclosed and is cut 05 from the rest of the machine except through the air gap existing between the core members 2 and 10. Since no openings are provided in the end bell 5, which extends from a groove 16 in the shaft 8, to the end plate l5,all of the active parts of the motor, except for the outer surface of the core member 2, are completely inclosed between the said end bell and the end frame 6, at the opposite end of the machine. As shown in Fig. 2 of the drawings, the difference in shape between the frame tand the core member 2 provides a plurality of passages 17, although similar openings may be otherwise provided, and there s suficient dnference in size between the end frame 7 and the bell to establish communication from a chamber 18, in which the fan 12 operates, to the passages 17. The end frame 7 is provided with inlet openings 19 near the shaft 8, and the frame 1 1s provided with outlet openings 20 near the plate 14 which constitutes a partition.

, When the machine is in operation, the shaft I in Fig. 3, to expose the inner surface of the rotor 4 as well as the outer surface of the stator core. The end frame 21, corresponding to the frame 6. of Fig. 1, is provided with an annular, inwardly extending projection 22 which extends into a groove 23 in the rotor, and the end bell24, which corresponds to the end hell 5 of Fig. 1, is formed to engage a groove 25 in the rotor'instead of a groove 16 in the shaft 8.. Both ends of the core members 2 and 10 and the windings are consequently entirely inclosed. The end,

member 21 is provided with inlet openings 26 near the shaft 8, but no openings are provided in the end member 27, which corresponds to the end member 7 of 1. When the rotor and the fan 12 are rotated, a circulation of air is established through the inlets 26 around the shaft, through the spider 9, outwardly through the chamber 18 and passages 17 to the-outlets 20-.

The structure shown. in'Fig. 3 permits a somewhat more complete cooling of the machine than is provided' by the arrangement shown in-Fig. 1, since the surfaces .of both core members of the machine which. are remote from the windings are exposed to the air currents. 1 Structural modifications may be effected within the spirit and scope of my invention, and I desire that only such limitations shall be imposed as are indicated in the appended .claims.

- I claim-as my invention:

1. A dynamo-electric machine comprising a stationary frame having a plurality of outlet openings. a core member supported r therein and so shaped as to provide cham- -..;therefor, amovable core member and Windbers communicating with the outlet openings, a closed end frame at one end and an open end frame at the other end of the supporting frame, an end bell Within the open frame providing a chamber which communicates with the first named chambers, a partition separating the space within the closed. end frame from the communicating chain-k bers, and a fan located in one of the chambers to provide a circulation of air into the open end frame and out of the supporting frame. e v

2. A dynamo-electric machine comprising a stationary core member and windings therefor, a movable core member and windings associated therewith, a stationary frame for supporting "the stationary core member, means cooperating with the same to entirely inclo'se one end of the cor members and windings, and means independent of the frame for inclosing'the opposite end of the core members and windings.

3. A dynamo-electric machine comprising a stationary core member and windingsings associated therewith,. a stationary frame for supporting the stationary core member, an end plate and a closed end frame for inclosing one endof the core members and windings, an openend frame at the opposite end of the-stationary frame, and independent means for inclosing the 'core members and windings within the open end frame.

4. A dynamo-electric machine comprising. a stationary frame having a plurality of outlet openings, a core member supported therein and so shaped as to provide cham bers communicating with the outlet openings, a closed end frame at one end and an open end frame at the other end of the supporting frame, an end bell within the open frame'providing a chamber which communicates with the first named chambers, and a partition separating the space within the closed end frame from the communicating chambers. v

In testimony whereof, I have hereunto subscribeokmy name this 25th day of May, 1911.

THEODORE HOOCK.

Witnesses: V

O'rro S. SCHAIRER, B. B. HINES. 

